11-29-2008, 12:00 PM
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I have a 72 bowed front that this just happed to me. There is no fix to old plastic. Being I didn't want to come down to my office with 72 gallons of water on the floor I drained the tank and stripped it down. I ordered a new plastic top from Pet Expo ($21.99 + tax).
The tops are siliconed on and I used a hack saw and cut 6" at a time and peeled the old plasic off. Also with a OLFA knife I cut the old silicone on the inside and outside toward the top. Once the blade cut though the silicone you could hear and feel the cutting of the old plasic top.
Once the old top is removed I used a flat single edge razor blade and scraped off the old remaining silicone so there was no old silicone left on the glass. After that I cleaned the area with Acetone to make sure there are no oils from your hands before mounting the new top on. I used aquarium silicone and ran a bead around the new top and pressed it on. Wait a few days for the silicone to set. This is much cheeper than buying a new tank and well worth the peace of mind that you will not have water on the floor after all the work of setting up a tank. This processed took ~3 hrs. But if you have to clean water up from the floor how long would that take?
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